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Publication numberUS3602602 A
Publication typeGrant
Publication dateAug 31, 1971
Filing dateMay 19, 1969
Priority dateMay 19, 1969
Publication numberUS 3602602 A, US 3602602A, US-A-3602602, US3602602 A, US3602602A
InventorsMotta Salvatore
Original AssigneeAvco Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Burst containment means
US 3602602 A
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Description  (OCR text may contain errors)

United States Patent 3,203,180 8/1965 Price Inventor Salvatore Motta Lowell, Mass.

App]. No. 825,724

Filed May 19, 1969 Patented Aug. 31,1971

Assignee Avco Corporation Cincinnati, Ohio BURST CONTAINMENT MEANS 2 Claims, 4 Drawing Figs.

U.S. C1 41-5/9, 74/608.415/197,415/214 Int. Cl Fl6p 1/02 Field of Search 74/608,

References Cited UNITED STATES PATENTS 1,698,514 1/1929 Schmidt 74/609 2,848,133 8/1958 Ramberg..... 156/189 2.999.667 9/1961 Morley 230/132 3,272,672 9/1966 Lampman et a1. 156/189 FOREIGN PATENTS 1.013.096 12/1965 Great Britain 415/174 Primary Examiner- Henry F. Raduazo Auorneys-Charles' M. Hoganand and Abraham Ogman ABSTRACT: The invention relates to a means for containing burst fragments generated when very high speed machinery, particularly gas turbines, rupture. The containment means is a winding of tape over the machinery housing and radially aligned along the expected path of travel of part fragments. The winding is formed from lightweight material having high strength and high elongation properties providing unusual energy absorbing capabilities which tends to contain the impact of burst fragments primarily by deflection rather than high yield stresses PATENIED was] l97| 3602.602

I N VENTOR. SALVATORE MOTTA BY M A ORNEY BURST CONTAINMENT MEANS The containment means described is used for the purpose of containing burst fragments within a localized area in the event the rotor of a very high speed machine ruptures. The invention has immediate application to the compressor section of gas turbines and can be further extended to the turbine section following the development of a high temperature and high elongation plastic fiber such as ahigh temperature nylon known as N orel for example.

In the past a metal, usually steel, in a single mass, laminated or woven form has been used. In one respect steel would appear to be an excellent candidate. in practice, particularly in aviation gas turbine applications, it is practically useless for a rather unusual reason, to be demonstrated.

It is an object of the invention to provide a burst containment means for high energy fragments which (i) avoids the limitations and disadvantages of prior art devices, (ii) is lightweight and compact, (iii) made from material which is capable of absorbing at least twice as much kinetic energy as steel of the same weight, (iv) is constructed from a nylon tape material having a high strength to failure ratio, and (v) comprises a winding of at least turns of tape.

in accordance with the invention a burst containment means comprises a housing, a winding made up of at least 15 overlying turns of a tape formed from a material having a specific energy absorbing capability of at least 200,000 (lN-LB/LB).

The novel features that are considered characteristic of the invention are set forth in the appended claims; the invention itself, however, both as to its organization and method of operation, together with additional objects and advantages thereof, will best be understood from the followingdescription of a specific embodiment when read in conjunction with the accompanying drawings, in which:

FIG. 1 is a partial cross-sectional representation of a burst containment means embodying the principles of the present invention;

FIG. 2 is a schematic representation of the winding comprising a portion of the burst containment means;

FlG. 3 is an expanded segmented view of the burst containment means showing structural details; and

FIG. 4 is a pictorial representation of the invention in the act of restraining high kinetic energy fragments.

The energy absorbing capability ofa material is determined by reference to a standard stress-strain curve of the material where stress is specified in LB/lN and the strain in lN/lN. The energy absorbing capability ofa material is determined by calculating the area under the stress-strain curve.

in tests conducted on a nylon ballistic cloth material the energy absorbing capability of the material was determined to be 8,000 (lN-LB/lN). The energy absorbing capability of steel that was considered suitable for fragment containment was determined to be 35,000 (lN-LB/lN it would appear from the foregoing that steel is much more suited for fragment containment than the nylon cloth. The fact of the matter is, however, that it is, from a practical point of view, much worse. For one thing, steel, because it has a high modulus of elasticity, tends to resist an impact with negligible deflection and consequently it tends to shatter rather than absorb energy.

Another very serious limitation of steel is its weight. For example, the specific energy absorbing capability, ie the energy that a material can absorb per pound of material, of steel is 121,000 (lN-LB/LB.) The specific energy absorbing capability of nylon, on the other hand, is 204,000 (IN-LB/LB) and is in fact a preferred candidate material.

The low strength material is utilized to its fullest capability when it is wound into a coil or winding containing at least 15 turns for reasons that will be explained hereinafter.

Referring to FlG. 1 of the drawings there is illustrated ing cross section the pertinent elements of a gas turbine compressor assembly 10. The assembly includes a hub 11 on the circumference of which are fastened a plurality of compressor blades 12. Surrounding and spaced from the compressor blades 12 is a housing 13 formed from any suitable metal material.

Lapped around the housing 13 is a winding 14 comprising at least 15 turns 16.

The turns 16 are formed from a continuous length of a material having a specific energy absorbing capability of 200,000 (lN-LB/LB) or greater. A nylon ballistic cloth as defined and identified in the Mill Standard specification Mil-(3123690 is the preferred material to use in making up the winding of 14.

FIG. 2 is a schematic representation showing the use of a continuous tape in making up the winding 14. It also represents schematically that there are no means for bonding or fastening the adjacent turns 16 of the winding 14 to each other or to the housing 13.

HO. 3 is another representation of the winding structure providing additional detail.

FIG. 4 of the drawings serves to illustrate why it is important to 1) provide a plurality of turns 16 preferably a minimum of 15 turns, and (2) provide a winding where adjacent turns are free to move relative to each other. FIG. 4 illustrates the winding 14 in the process of absorbing three high energy fragments from an exploding mechanical member. The housing 11 has been completely shattered and is no longer a factor in containing the fragments. The configuration of the winding 14 has changed into an optimum configuration for the type of impact it is resisting. The wide center portion 19 of the three legs of the winding indicate that'a number of turns 16 of the winding 14 have failed in tension. The high density of turns 16 adjacent to the outside of the winding 14 indicate that a substantial number of turns 16 are compressed and absorbing the energy applied to the winding by the fragments.

it is clear that the amount of energy that is to be contained will vary with the speed and the configuration of the high energy fragments. The primary use of the housing relates to its function in connection with the gas turbine compressor. Its very presence causes it to absorb some of the energy from fragments; but because it is made of metal and because its thickness is determined by the gas turbine performance, it is not a' good energy absorber and in fact the major portion of the energy contained in a fragment is absorbed by the winding 14. On occasion it has been noted that the housing upon rupturing creates secondary high energy fragments but generally these do not pose a serious problem.

A number of tests have been made by preparing a 3-inch wide winding over an 18-inch diameter housing. Each turn was one thirty-second inch thick and 33% turns were used to make up the complete winding. This particular design has successfully resisted impact up to and including 83,500 IN-lbs. Up to 40 percent of the turns experienced one or more breaks. These breaks were examined and were determined to be tension breaks. The intact" turns underwent appreciable elon' gation. High energy fragments were completely contained in the windings.

The various features and advantages of the invention are thought to be clear from the foregoing description. Various other features and advantages not specifically enumerated will undoubtedly occur to those versed in the art, as likewise will many variations and modifications of the preferred embodiment illustrated, all of which may be achieved without departing from the spirit and scope of the invention as defined by the following claims:

1. A burst containment means comprising the combination of a housing about a rotated bladed structure, a winding on said housing consisting essentially of at least 15 overlapping turns of a tape formed from a nylon ballistic material having a specific energy absorbing capability of at least 200,000 (lN-LB/LB).

2. A burst containment means as defined in claim 1 in which the winding is formed from a woven tape of a nylon ballistic material.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3936219 *Jun 10, 1974Feb 3, 1976Westinghouse Electric CorporationFlexible turbine missile shield
US3949711 *Feb 8, 1974Apr 13, 1976Stackpole Carbon CompanyRotary engine with graphite housing
US4057359 *Dec 22, 1975Nov 8, 1977Chevron Research CompanyBallistic nylon fabric turbine governor housing shielding means
US4149824 *Dec 23, 1976Apr 17, 1979General Electric CompanyBlade containment device
US4304633 *Aug 20, 1979Dec 8, 1981Hitachi, Ltd.Nuclear power plant
US4377370 *Oct 16, 1980Mar 22, 1983Societe Nationale D'etude Et De Construction De Moteurs D'aviation, "S.N.E.C.M.A."Safety device for a rotating element of a turbine engine
US4452565 *Dec 21, 1981Jun 5, 1984United Technologies CorporationFor a rotary machine
US4475864 *Dec 21, 1981Oct 9, 1984United Technologies CorporationContainment structure
US4699567 *Dec 31, 1986Oct 13, 1987Rolls-Royce PlcFan duct casing
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US4746150 *Apr 27, 1987May 24, 1988Nitro Nobel AbJoint for joining together two pipe ends
US4786231 *Dec 1, 1986Nov 22, 1988Kelley Winfield LNoise attenuating and air streamlining spiral
US4818176 *Apr 7, 1988Apr 4, 1989Mtu Motoren-Und Turbinen-Union Muenchen GmbhBurst guard ring for turbo-engine housings
US4961685 *Sep 1, 1989Oct 9, 1990Mtu-Motoren-Und Turbinen-Union Muenchen GmbhProtection ring of fiber material for containing fragments of bursting structural components
US5163809 *Apr 29, 1991Nov 17, 1992Pratt & Whitney Canada, Inc.Spiral wound containment ring
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US5614280 *Dec 2, 1993Mar 25, 1997James W. Post, IIIHigh strength ballistic textile laminate
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US6182531Jun 12, 1998Feb 6, 2001The Boeing CompanyContainment ring for flywheel failure
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US7597040Nov 1, 2005Oct 6, 2009The Boeing CompanyComposite containment of high energy debris and pressure
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US8528328 *Oct 13, 2010Sep 10, 2013Mtu Friedrichshafen GmbhExplosion protection for a turbine and combustion engine
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DE3243887A1 *Nov 26, 1982Jun 30, 1983United Technologies CorpHerstellverfahren fuer eine teilchenauffangvorrichtung, insbesondere ein schutzgehaeuse, schutzueberzugsauftragsverfahren und schutzvorrichtung
DE4223496A1 *Jul 17, 1992Jan 20, 1994Asea Brown BoveriReducing kinetic energy of bursting parts in turbines - involves crumple zone between inner and outer rings set between housing and rotor to absorb energy and contain fractured parts
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EP0718471A1 *Dec 20, 1995Jun 26, 1996Hispano-SuizaContainment ring for a turbomachine
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Classifications
U.S. Classification415/9, 74/608, 415/197
International ClassificationF01D21/00, F01D21/04
Cooperative ClassificationF01D21/045
European ClassificationF01D21/04B